Nitrification in Fixed Bed Reactors Treating Saline Wastewater
Two fixed bed reactors for nitrification with either polyethylene/clay sinter lamellas (FBR A) or porous ceramic rings (FBR B) were continously run for treating synthetic saline wastewater. Seawater from Hafen Büsum was used as an inoculums. The performance of the system was evaluated under differen...
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KIT Scientific Publishing
2021
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| description | Two fixed bed reactors for nitrification with either polyethylene/clay sinter lamellas (FBR A) or porous ceramic rings (FBR B) were continously run for treating synthetic saline wastewater. Seawater from Hafen Büsum was used as an inoculums. The performance of the system was evaluated under different operating conditions. A better overall nitrification without nitrite accumulation was observed in FBR B during continuous incubation. However, in term of ammonia (AOR) and nitrite oxidation rates (NOR) that were determined in batch incubations, FBR A revealed a higher AOR and NOR of 6 and 7 mg N L-1 h-1, compared to the AOR and NOR of 5 and 5.9 mg N L-1 h-1 in FBR B, respectively. For studies of the effect of fluctuating salinity on the nitrification, polyethylene/clay sinter lamellas or porous ceramic rings from FBR A and B, respectively, were used as a source of immobilized nitrifiers. Salt concentrations were decreased from 3.5% to 0.03% via 2, 1 and 0.5% and increased from 3.5% to 5, 7 and 9%. A similar result for AOR and NOR during batch incubation was obtained for both substrata in FBR A and FBR B. The salinity changes influenced more the nitrite oxidizing bacteria (NOB) than the ammonia oxidizing bacteria (AOB). Measurement of oxidation rates during changing conditions show that the NORs were always higher than the AORs in all reactors, especially in initial phase. However, NORs were more sensitive to the salinity fluctuation than AORs, especially at lower salinity. The AORs remained constant for 0.5-3.5% NaCl and dropped to 70% and 68.5% after the salt concentration was brought to 0.034 or 5%, respectively. The NORs decreased significantly to 62% and 87.5% of initial rates after the salt concentration was changed to 2 and 5%, respectively.Non-halotolerant nitrifiers reactors with fresh polyethylene/clay as supporting material were inoculated with water samples taken from a ""Brackwasser""-location at the North Sea and were continuously run. The salt content in medium was 0% at the start and was then increased up to 10.5%. Increases of the salt concentration in a non-salt-adapted FBR suppressed more to NOR than AOR. When salinity was increased from 0.03% to 0.5, 1 and 2%, AORs remained constant. The AORs were approx. 90% of initial rates after the salt concentrations were increased stepwise to 3.5%, whereas the NORs decreased to 85, 52 and 36% of initial rate after salinity was increased to 1, 2 and 3.5%, respectively. |
| format | Online |
| id | doab-20.500.12854ir-54686 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2021 |
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| spelling | doab-20.500.12854ir-546862024-04-04T19:18:55Z Nitrification in Fixed Bed Reactors Treating Saline Wastewater Sudarno QC1-999 Saline wastewater Free ammonia und Free nitrous acid Fixed bed-reactors Halophilic nitrification thema EDItEUR::P Mathematics and Science::PH Physics Two fixed bed reactors for nitrification with either polyethylene/clay sinter lamellas (FBR A) or porous ceramic rings (FBR B) were continously run for treating synthetic saline wastewater. Seawater from Hafen Büsum was used as an inoculums. The performance of the system was evaluated under different operating conditions. A better overall nitrification without nitrite accumulation was observed in FBR B during continuous incubation. However, in term of ammonia (AOR) and nitrite oxidation rates (NOR) that were determined in batch incubations, FBR A revealed a higher AOR and NOR of 6 and 7 mg N L-1 h-1, compared to the AOR and NOR of 5 and 5.9 mg N L-1 h-1 in FBR B, respectively. For studies of the effect of fluctuating salinity on the nitrification, polyethylene/clay sinter lamellas or porous ceramic rings from FBR A and B, respectively, were used as a source of immobilized nitrifiers. Salt concentrations were decreased from 3.5% to 0.03% via 2, 1 and 0.5% and increased from 3.5% to 5, 7 and 9%. A similar result for AOR and NOR during batch incubation was obtained for both substrata in FBR A and FBR B. The salinity changes influenced more the nitrite oxidizing bacteria (NOB) than the ammonia oxidizing bacteria (AOB). Measurement of oxidation rates during changing conditions show that the NORs were always higher than the AORs in all reactors, especially in initial phase. However, NORs were more sensitive to the salinity fluctuation than AORs, especially at lower salinity. The AORs remained constant for 0.5-3.5% NaCl and dropped to 70% and 68.5% after the salt concentration was brought to 0.034 or 5%, respectively. The NORs decreased significantly to 62% and 87.5% of initial rates after the salt concentration was changed to 2 and 5%, respectively.Non-halotolerant nitrifiers reactors with fresh polyethylene/clay as supporting material were inoculated with water samples taken from a ""Brackwasser""-location at the North Sea and were continuously run. The salt content in medium was 0% at the start and was then increased up to 10.5%. Increases of the salt concentration in a non-salt-adapted FBR suppressed more to NOR than AOR. When salinity was increased from 0.03% to 0.5, 1 and 2%, AORs remained constant. The AORs were approx. 90% of initial rates after the salt concentrations were increased stepwise to 3.5%, whereas the NORs decreased to 85, 52 and 36% of initial rate after salinity was increased to 1, 2 and 3.5%, respectively. 2021-02-11T21:01:44Z 2021-02-11T21:01:44Z 2019-07-30 20:01:58 2011 book 34696 1728709 9783866446915 https://directory.doabooks.org/handle/20.500.12854/54686 eng Karlsruher Berichte zur Ingenieurbiologie / Institut für Ingenieurbiologie und Biotechnologie des Abwassers, Karlsruher Institut für Technologie image/jpeg Attribution-NonCommercial-NoDerivatives 4.0 International https://www.ksp.kit.edu/9783866446915 KIT Scientific Publishing 10.5445/KSP/1000023321 10.5445/KSP/1000023321 68fffc18-8f7b-44fa-ac7e-0b7d7d979bd2 9783866446915 XXIV, 173 p. open access |
| spellingShingle | QC1-999 Saline wastewater Free ammonia und Free nitrous acid Fixed bed-reactors Halophilic nitrification thema EDItEUR::P Mathematics and Science::PH Physics Sudarno Nitrification in Fixed Bed Reactors Treating Saline Wastewater |
| title | Nitrification in Fixed Bed Reactors Treating Saline Wastewater |
| title_full | Nitrification in Fixed Bed Reactors Treating Saline Wastewater |
| title_fullStr | Nitrification in Fixed Bed Reactors Treating Saline Wastewater |
| title_full_unstemmed | Nitrification in Fixed Bed Reactors Treating Saline Wastewater |
| title_short | Nitrification in Fixed Bed Reactors Treating Saline Wastewater |
| title_sort | nitrification in fixed bed reactors treating saline wastewater |
| topic | QC1-999 Saline wastewater Free ammonia und Free nitrous acid Fixed bed-reactors Halophilic nitrification thema EDItEUR::P Mathematics and Science::PH Physics |
| topic_facet | QC1-999 Saline wastewater Free ammonia und Free nitrous acid Fixed bed-reactors Halophilic nitrification thema EDItEUR::P Mathematics and Science::PH Physics |
| url | 34696 |
| work_keys_str_mv | AT sudarno nitrificationinfixedbedreactorstreatingsalinewastewater |